This article was reviewed by Darragh O’Carroll, MD. Understanding Blood Tests: How They Work and What They Can Tell You Blood ...

Red blood cells transport oxygen throughout your body, including to vital organs and tissues. They also help your body get rid of carbon dioxide. Too little or too many red blood cells may be ...

When you have a low red blood cell count, your body will show that your blood health may be at risk. We help you recognize ...

A high red blood cell count can occur for many reasons, including excessive cell production, changes in blood volume, or underlying medical conditions. Sometimes, the cause is unknown. Erythrocytes, ...

If adults have nucleated red blood cells (NRBCs) in their blood, it’s usually a sign of a life threatening condition. The optimal NRBC count is 0. Even very low NRBC counts could cause a doctor to ...

The red cell distribution width (RDW) blood test measures differences in the volume and size of your red blood cells. Red blood cells help carry oxygen from the lungs to other parts of your body.